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<div style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);" class="elementToProof">
`<b><span style="color: red;" class="ContentPasted0">../mpich-4.1.2/src/mpid/ch3/src/ch3u_request.c at line 480:
</span></b>` that line is</div>
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```</div>
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MPIDI_Datatype_get_info(rreq->dev.user_count, rreq->dev.datatype,
<div class="ContentPasted1"> dt_contig, userbuf_sz, dt_ptr, dt_true_lb);</div>
<br>
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```</div>
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That is a macro and the assertion is inside the macro expansion. Usually, the assertion indicates a wrong datatype handle. Do you think you can dump the datatype as hex value?</div>
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<br>
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-- <br>
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<div style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);" class="elementToProof">
Hui<br>
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>From:</b> Mccall, Kurt E. (MSFC-EV41) via discuss <discuss@mpich.org><br>
<b>Sent:</b> Tuesday, October 10, 2023 11:05 AM<br>
<b>To:</b> discuss@mpich.org <discuss@mpich.org><br>
<b>Cc:</b> Mccall, Kurt E. (MSFC-EV41) <kurt.e.mccall@nasa.gov><br>
<b>Subject:</b> [mpich-discuss] MPI_Comm_free assertion failure</font>
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<p class="x_MsoNormal">Before calling MPI_Finalize, I am calling MPI_Comm_free at both ends (processes) of an intercommunicator created by MPI_Intercomm_create
</p>
<p class="x_MsoNormal">and am crashing with the following error in one of the processes:</p>
<p class="x_MsoNormal"> </p>
<p class="x_MsoNormal"><b><span style="color:red">Assertion failed in file ../mpich-4.1.2/src/mpid/ch3/src/ch3u_request.c at line 480:
</span></b></p>
<p class="x_MsoNormal">/opt/mpich/lib/libmpi.so.12(+0x2d3bf3) [0x7f6d10e1fbf3]</p>
<p class="x_MsoNormal">/opt/mpich/lib/libmpi.so.12(+0x225124) [0x7f6d10d71124]</p>
<p class="x_MsoNormal">/opt/mpich/lib/libmpi.so.12(+0x33016) [0x7f6d10b7f016]</p>
<p class="x_MsoNormal">/opt/mpich/lib/libmpi.so.12(+0x29eada) [0x7f6d10deaada]</p>
<p class="x_MsoNormal">/opt/mpich/lib/libmpi.so.12(+0x1dfb7c) [0x7f6d10d2bb7c]</p>
<p class="x_MsoNormal">/opt/mpich/lib/libmpi.so.12(+0x1d78cd) [0x7f6d10d238cd]</p>
<p class="x_MsoNormal">/opt/mpich/lib/libmpi.so.12(<b><span style="color:red">PMPI_Comm_free</span></b>+0xe7) [0x7f6d10bfe6b7]</p>
<p class="x_MsoNormal">/home/kmccall/Needles2/NeedlesMpiMM(_ZN7needles12IntercomList20handleFailedIntercomERSt17_Rb_tree_iteratorISt4pairIKiPNS_16IntercomListElemEEEiPKc+0xae) [0x4c348a]</p>
<p class="x_MsoNormal">/home/kmccall/Needles2/NeedlesMpiMM(_ZN7needles12IntercomList19disconnectIntercomsERilb+0xcf) [0x4c36fb]</p>
<p class="x_MsoNormal">/home/kmccall/Needles2/NeedlesMpiMM(_ZN7needles16NeedlesMpiMaster8finalizeEv+0x25f) [0x496e25]</p>
<p class="x_MsoNormal">/home/kmccall/Needles2/NeedlesMpiMM(_ZN7needles16NeedlesMpiMaster4loopEv+0x74e) [0x49355a]</p>
<p class="x_MsoNormal">/home/kmccall/Needles2/NeedlesMpiMM(main+0x4af) [0x48d1e5]</p>
<p class="x_MsoNormal">/lib64/libc.so.6(__libc_start_main+0xf3) [0x7f6d0f186ca3]</p>
<p class="x_MsoNormal">/home/kmccall/Needles2/NeedlesMpiMM(_start+0x2e) [0x48cc7e]</p>
<p class="x_MsoNormal"><b><span style="color:red">internal ABORT - process 0</span></b></p>
<p class="x_MsoNormal"><b><span style="color:red"> </span></b></p>
<p class="x_MsoNormal">I looked in ch3u_request.c and there seems to be no assertion at line 480. If I forgo the MPI_Comm_free in the first process, the</p>
<p class="x_MsoNormal">same error then occurs in the second process. Does this give you any clue as to what I am doing wrong?</p>
<p class="x_MsoNormal"> </p>
<p class="x_MsoNormal">Thanks,</p>
<p class="x_MsoNormal">Kurt</p>
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